Drill bit



Sept' 13 1932- w. PEARCE 1,876,740

DRILL BIT Fild manv 2, 192s ggf/.5,

INVENTOR. 7W ff- @ma Patented Sept. 13, 1932 UNET STATES WILLIAM L. PEABCE, OF HOUSTON, TEXASl l DRILL BIT Application filed March 2, 1929. SeralNo.. 343,978.

This invention relates to new and useful improvements in a drill bit.

One obj ect of the invention is to provide a drill bit having novel means for supplying the drilling fluid to the bit body and blades, to the end that the sides of the bit body will be flushed with said fluid and the fluid will also be conducted down to the cutting edges of the blades.

Another object of the invention is to provide a drill bit of the character described having channels for conveying the flushing fluid that will not be liable to become clogged up and that will conduct said fluid underneath the formation that may adhere to the bit and wash the same off and keep the bit comparatively clean.

lVith the above and other objects in view this invention has particular relation to certain novel features of construction, operation and use, an example of which is given in this specification and illustrated in the accom panying drawing wherein:

Figure l shows a side elevation of the bit.

Figure 2 shows a transverse sectional view, on the line 2-2 of Figure. 1, and,

Figure 3 shows a cross sectional view taken on the line 3-3 of Figure l.

Referring .now more particularly to the drawing, wherein like numerals of reference designate similar parts in each of the figures, the numeral l designates the body of the bit whose lower end is flattened, forming the opposite flat faces 2, 2. The lower end of the body terminates in the oppositely curved cutting blades 3, 3. The upper end of the body is ext-ended and formed with an externally threaded shank 4 onto which the drill collar 5 is threaded. By means of this collar the bit is attached to the drill stem.

In each face 2 there is a deep channel 7. These channels are on opposite sides of, and substantially parallel with, the axis on which the drill rotates and located approximately midway between said axis and the corresponding edge of the bit, and extend down near to the cutting edge of the corresponding blades. These channels continue on upl through the bit body and shank forming the bores 8, 8, which terminate at the upper end fi of the shank within said collar 5.. y

As drilling progresses the flushing fluid is forced Linder pressure down through the drill stem and through the bores .8 and along the channels 7. Part of the fluid will be spread f.,

starts to collect on and adhere to the faces 2 the flushing fluid will be conducted, by said channels,underneath the adhering material and the same will be forced by said fluid from said faces. For this purpose each channel is somewhat narrower than its depth so that the adhering material will bridge over the channel and will not clog, or completely ll the same.

In the construction of the bit after the same is shaped and while the metal is hot a fuller is used to form the Channels 7 and said channels are then continued upwardly through the shank by boring therethrough to form the bores 8 which match with the channels.

It is to be noted that the bores 8 are of smaller Y diameter than that ,of' the corresponding channels. The drilling fluid, forced through the channels, under pressure, will expand as it emerges from the channels and will thus have a tendency to spread over the corre- 'f sponding faces 2 and keep the same washed clean.

What claim is l. A drill bit having a body whose upper end is formed into a shank and whose lower end is flattened having opposite flat faces, the lower end of said body terminating in oppositely curved cutting edges, a groove in each face having a greater depth than its width and being outwardly flared and whose upper end continues on up through the shank, forming a bore, and whose lower end terminates near the corresponding cutting edge, each groove being located approximately midway between the axis of the bit and the corresponding edge of said bit.

2. A drill bit having a body Whose upper end is substantially cylindrical and formed into a shank and whose lower end is flattened having the opposite flat faces, the lower end of said body terminating in oppositely curved cutting edges, anelongated n'armw groove in each face whose upper end continues on up throu h the shank, forming a bore in substantial a ignment with said groove and of less capacity than the groove, and whose lower Y end terminates near the corresponding eutting edge, each groove being narrower than its depth.

43. A drillbit having a body Whose upper end is formed into a shank and whose lower end is flattened having the opposite flat faces, the lower end of said body terminating in oppositely disposed cutting edges, a groove in each face of greater depth than width, and whose upper end continues on up through the shank, forming a bore, and whose lower end terminates near the corresponding cutting edge, said grooves being outwardly ared and said bores being of less diameter than that of the corresponding grooves.

In testimony whereof I have signed my name to this specification. o

WILLIAM L. PEARCE. 

